Does your system support the CDF format? I saw netCDF. NASA actually provides a dlm plugin. If GDL supports IDL dlms the way that IDL does, it might work right out of the box. If it doesn't work, I'd like to request that as a feature. For people looking for a free alternative to IDL in the area that I work, absence of CDF support is basically a deal breaker.
Here is a link to the CDF site, for reference:
do you have examples around ? (data files and codes in the IDL syntax) We can give a look.
We have public and private test cases for some libraries in IDL syntax, which do work with success. E.g. is AstroLib, HEALpix, PDS, iCosmo (except one minor module). We are finishing exploring Scanamorphos …